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Acidities of CeO 2 and Ce 0.5 Zr 0.5 O 2 solid solutions studied by NH 3 ‐TPD
Author(s) -
Miao JianYing,
Yang LeFu,
Cai JunXiu
Publication year - 1999
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/(sici)1096-9918(199908)28:1<123::aid-sia632>3.0.co;2-6
Subject(s) - solid solution , desorption , ammonia , catalysis , combustion , chemistry , methane , inorganic chemistry , analytical chemistry (journal) , environmental chemistry , organic chemistry , adsorption
Ammonia temperature‐programmed desorption (NH 3 ‐TPD) was used to study the acidities of CeO 2 and Ce 0.5 Zr 0.5 O 2 solid solutions. The NH 3 ‐TPD peaks of both CeO 2 and Ce 0.5 Zr 0.5 O 2 exist at 100–850 °C. The ratio of the lower and middle temperature peak areas to the higher temperature peak is decreased for Ce 0.5 Zr 0.5 O 2 relative to CeO 2 under all pretreatment conditions, which suggests that Ce 0.5 Zr 0.5 O 2 has more acid sites of higher energy than CeO 2 . This may be one of the reasons why Ce 0.5 Zr 0.5 O 2 is a more highly efficient catalyst for methane combustion than CeO 2 . Copyright © 1999 John Wiley & Sons, Ltd.